I’m making a website for my friend who’s using Google Domains and G-Suite for email and was previously using Squarespace for her site. Squarespace has now expired, I’ve made a static site and want to host it on Netlify. In order to get the site working on the domain registered at Google Domainss, whilst keeping the G-suite setup is it just a case of changing the CNAME to site-name.netlify.com?

Without knowing which domain, yes. You just need to create a CNAME record on your subdomain to your Netlify site, and create an A record on the bare domain (assuming you have one) with a value of 104.198.14.52. There should actually be instructions on how to setup DNS on your site’s domain page. You can also read more about this in our docs.